Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a18557e5c0bcb7…

MALICIOUS

PDF

142.1 KB Created: 2021-05-25 06:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 71237dc1312a19bdd9377d6e88bce492 SHA-1: 72fd00524ac1050e56a722fa2af6e8cc6a013670 SHA-256: 52a18557e5c0bcb7f22828ac69b5d99ba23681c76ed0c4afc87ecac3b6f209ad
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=food+wars+season+3+english+dub+hulu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421641/normal_600e8466e0918.pdfIn PDF document text
    • https://rosexanovetaw.weebly.com/uploads/1/3/0/8/130814227/lowajolafoxemuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5fd17dbe5a5b8.pdfIn PDF document text
    • https://mefirotevi.weebly.com/uploads/1/3/5/3/135314773/batizunepugaxa-merobujokola-gasesezimovaso-xazixukavep.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/7397085.pdfIn PDF document text
    • https://bivufinemena.weebly.com/uploads/1/3/1/3/131380184/lezowetobisop_silixinolasewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475215/normal_5fe8a369beb81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476429/normal_60400d0a43961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418777/normal_5fd9a0db54f73.pdfIn PDF document text
    • https://gikejujeg.weebly.com/uploads/1/3/5/9/135966421/zesodarirex.pdfIn PDF document text
    • https://vagezelez.weebly.com/uploads/1/3/0/8/130873856/ridamikino-doduxiropan-wakodepexuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465144/normal_5fe5bc1341ded.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/845ed273-a936-44b9-8626-916adea9e601/como_se_siembra_el_arroz_en_colombia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6556b2fb-0e94-4be3-a1bc-a2359d7b71a8/12783496451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeee9671-0364-48cb-b929-6585ea857b96/where_can_i_donate_used_clothing_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c291cbb5-c959-4f06-a042-abb3b162584a/technical_drawing_tutorial_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb7f909-bb2e-4c52-b9f3-d7be17347e7f/are_plantronics_headsets_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea7e4cc-3e70-4897-b67c-b3bf845e3a2c/7616572124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825961ae-1fb5-4095-9349-3c29d6efa9aa/95702980174.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec9bd4d-fc2f-4a99-9f8f-d8e42899a0a3/37926208494.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C8C4 2916 bytes
SHA-256: 2d62ba8f068a29d9b8b28661ad71e1e860caa80e17b30fdb34332bce8de9b100
font_01_sfnt_off0001d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D323 5440 bytes
SHA-256: f9982caa67520aec7aeabcb6d27028efd7dba7ee621a02a8d111d241705b9d11
font_02_sfnt_off0001e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5AE 14616 bytes
SHA-256: e6f9429b01a38d4291de1e615b4dbb96ff9b4c74b9f1456f20c4f99582b37308
font_03_sfnt_off000214f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214F4 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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